11,192 research outputs found
Computational models of consumer confidence from large-scale online attention data: crowd-sourcing econometrics
Economies are instances of complex socio-technical systems that are shaped by
the interactions of large numbers of individuals. The individual behavior and
decision-making of consumer agents is determined by complex psychological
dynamics that include their own assessment of present and future economic
conditions as well as those of others, potentially leading to feedback loops
that affect the macroscopic state of the economic system. We propose that the
large-scale interactions of a nation's citizens with its online resources can
reveal the complex dynamics of their collective psychology, including their
assessment of future system states. Here we introduce a behavioral index of
Chinese Consumer Confidence (C3I) that computationally relates large-scale
online search behavior recorded by Google Trends data to the macroscopic
variable of consumer confidence. Our results indicate that such computational
indices may reveal the components and complex dynamics of consumer psychology
as a collective socio-economic phenomenon, potentially leading to improved and
more refined economic forecasting.Comment: 21 pages, 6 figures, 13 table
From Frequency to Meaning: Vector Space Models of Semantics
Computers understand very little of the meaning of human language. This
profoundly limits our ability to give instructions to computers, the ability of
computers to explain their actions to us, and the ability of computers to
analyse and process text. Vector space models (VSMs) of semantics are beginning
to address these limits. This paper surveys the use of VSMs for semantic
processing of text. We organize the literature on VSMs according to the
structure of the matrix in a VSM. There are currently three broad classes of
VSMs, based on term-document, word-context, and pair-pattern matrices, yielding
three classes of applications. We survey a broad range of applications in these
three categories and we take a detailed look at a specific open source project
in each category. Our goal in this survey is to show the breadth of
applications of VSMs for semantics, to provide a new perspective on VSMs for
those who are already familiar with the area, and to provide pointers into the
literature for those who are less familiar with the field
Japanese/English Cross-Language Information Retrieval: Exploration of Query Translation and Transliteration
Cross-language information retrieval (CLIR), where queries and documents are
in different languages, has of late become one of the major topics within the
information retrieval community. This paper proposes a Japanese/English CLIR
system, where we combine a query translation and retrieval modules. We
currently target the retrieval of technical documents, and therefore the
performance of our system is highly dependent on the quality of the translation
of technical terms. However, the technical term translation is still
problematic in that technical terms are often compound words, and thus new
terms are progressively created by combining existing base words. In addition,
Japanese often represents loanwords based on its special phonogram.
Consequently, existing dictionaries find it difficult to achieve sufficient
coverage. To counter the first problem, we produce a Japanese/English
dictionary for base words, and translate compound words on a word-by-word
basis. We also use a probabilistic method to resolve translation ambiguity. For
the second problem, we use a transliteration method, which corresponds words
unlisted in the base word dictionary to their phonetic equivalents in the
target language. We evaluate our system using a test collection for CLIR, and
show that both the compound word translation and transliteration methods
improve the system performance
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